Gamma-ray bursts (GRBs) are characterized by ultra-relativistic outflows, while supernovae are generally
characterized by non-relativistic ejecta. GRB afterglows decelerate rapidly, usually within days, because their ...

We present X-ray, UV/optical, and radio observations of the stripped-envelope, core-collapse supernova (SN)
2011ei, one of the least luminous SNe IIb or Ib observed to date. Our observations begin with a discovery within
∼1 ...

High-dispersion observations of the Na i D λλ5890, 5896 and K i λλ7665, 7699 interstellar lines, and the diffuse
interstellar band at 5780 Å in the spectra of 32 Type Ia supernovae are used as an independent means of ...

Ultraviolet, optical, and near-infrared photometry and optical spectroscopy of the broad-lined Type Ic supernova (SN) 2009bb are presented, following the flux evolution from -10 to +285 days past B-band maximum. Thanks to ...

We report the late-time evolution of Type IIb supernova (SN IIb) 2013df. SN 2013df showed a dramatic change in its spectral features at similar to 1 yr after the explosion. Early on it showed typical characteristics shared ...